Anaesthetic compound



Patented 13, 1929.

UNITED STATES PATENT OFFICE.

ROGER ADAMS, OF URBANA, ILLINOIS, AND OTIS A. BARNES, OF COLORADO SPRINGS, COLORADO, ASSIGNORS T ABBOTT LABORATORIES, OF NORTH CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

ANAESTHETIC comromv'n.

No Drawing.

Our invention relates to substituted omega-piperidylallryl"esters of ,p-amlno ben 'zoic acid, having the general formula- 0 6 1 NomwcHxH NH 2 x a CHr-CHR in which 00 represents two or more, and R.

10 represents an organic radical.

These compounds may be prepared by the condensation of p-nitrobenzoyl chloride with ,a substituted piperidine, and reducing the -p-nitrobenz0yl ester of the substituted p1- l5 peridine to the corresponding p-aminobenzoyl ester. 4

Example eta (beta-cwrbometlz owypiperidyl) ethyl p-amnlnobenzoate hydrochloride.

' solution is added, and the condensation product taken up in ether. After drying the ether, dry hydrogen chloride is passed in, whereupon the hydrocloride of beta (betacarbomethoxypiperi dyl)-ethylp-nitrobenzoate hydrocloride is formed. After recrystallization, it melts at'197198 C.

The above nitro ester is reduced to the corresponding amino compound as follows: 20 grams aredissolved in 400 cc. of hot ab- 40 solute alcohol, and, without cooling, the material is reduced by hydrogen, using 0.3 gram of platinum oxide as a catalyst. "The alcohol is evaporated in vacuo, With the reaction product protected by hydrogen. The

. reduced product, which is the hydrochloride of beta (beta-carbomethoxypiperidyl) ethyl p-aminobenzoate, is recrystallized from absolute methyl alcohol, preferably guarding against oxidation by an inert gas. The

produpt .is a White solid melting at 186+ Applieationfiled January 13, 1928. Serial No. 246,653.

Example 2.-Gwm/nm beta-carbometliomiypzpem'cZZ) "om Z p-amz'nobenzoate lie d1 clorz'de.

Methyl hexahydronicotinate is condensed with gammabromopropyl p-nitrohenzoate at 100-105 (1., essentially as described in EX- ample 1. Upon recrystallization of the hydrochloride from n-butyl alcohol, it melts at 207-208 35 20 grams of the gamma(beta-carbomc thoxyp1peridyl)- -propyl p-nitrobenzoate hy- .drochloride obtained in the above manner is dissolved in 400 ec.'of absolute ethyl alcohol, and reduced by means of hydrogen and a platinum catalyst, as described in Example 1. Upon recrystallization from absolute methyl alcohol, it was obtained as white crystals melting at 195-196 O.

The described details of materials and process used being merely illustrative of preferred applications of our invention, it will be understood that the scope of the same must be determined by reference to, the appended claims, said claims being construed as broadly as possible, consistent with the state of the art.

We claim as our invention:

1. As new products of manufacture, the substituted omega-piperidyl-alkyl esters of p-ammobenzoic acid, having the general formula N110 "COO(CH2) x hc formula O Hz OH l Hz NHr-O-COO 0H,

O OOOR in which m represents two or more, and R 4. As a new product of manufacture, 15 represents an aliphatic hydrocarbon radical. gamma (beta-carbomethoxypiperidyl) 3. As new products of manufacture, the propyl p-nitrobenzoate hydrochloride, havsubstituted omegai'peridyl-alkyl esters of ing the formula 5 p-aminobenzoic aci having the formula ROGER ADAMS. in which as represents two or more. v OTIS A. BARNES. 

